Use filegroup name not contents in $(location ...)

Bug: 124218911
Test: make checkbuild
Change-Id: I0427ed4c73e4cf06f09b520a886ccf6ed0d150b2
diff --git a/Android.bp b/Android.bp
index b237684..d413177 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1115,7 +1115,7 @@
      "-overview $(location core/java/overview.html) " +
      // Federate Support Library references against local API file.
      "-federate SupportLib https://developer.android.com " +
-     "-federationapi SupportLib $(location current/support-api.txt) "
+     "-federationapi SupportLib $(location :current-support-api) "
 
 framework_docs_only_libs = [
     "voip-common",